**_What happens if the respected minister turns out to be… a psycho?_** In the greater London area, a young woman (Susan Penhaligon) is disturbed by the unethical practices of a Catholic priest (Anthony Sharp). Stephanie Beacham plays her older sister and Norman Eshley a mutual friend, a young minister. “House of Mortal Sin” (1976) is a drama/crime thriller with some horror that mixes bits from "Psycho," “Rachel, Rachel,” "Rosemary's Baby" and "One Flew Over the Cuckoo's Nest," just with a British milieu. As good as those films are, this one’s pretty much on par in its own unique way, wh...